/*
 * Copyright 2019 ABSA Group Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package za.co.absa.commons.reflect.extractors

class SafeTypeMatchingExtractor[T](lazyClass: => Class[T]) {
  def this(className: String) = this(Class.forName(className).asInstanceOf[Class[T]])

  private val classIfAvailable: Option[Class[_]] =
    try Some(lazyClass)
    catch {
      case _: NoClassDefFoundError | _: ClassNotFoundException => None
    }

  def unapply(arg: Any): Option[T] =
    for {
      clazz <- classIfAvailable
      if arg != null && clazz.isAssignableFrom(arg.getClass)
    } yield arg.asInstanceOf[T]
}
